Threading and facing tool



Febfi, 1936;. w. w. VOSPER THREADING AND FACING TOOL Filed Sept. 4, 1934Cir Patented Feb. 4, 1936 THREADING AND FACING TOQL William W. Vesper,Toledo, Ohio, assignor to The Toledo Pipe Threading Machine Company,Toledo, Ohio, a corporation of Ohio Application September 4, 1934,Serial No. 742,623

Claims.

This invention relates to establishing helical ways and additionalbearing face portions in a common piece of work.

This invention has utility when incorporated in apparatus for dressingthe shanks or stems for drill bits, as in rock drilling equipment.

Referring to the drawing:

Fig. 1 is a view of an embodiment of the invention as a threadgenerating tool to act upon a rock drill shank, and being in position tocomplete the shank by terminally facing or dressing the shank forsupplemental bit seating in addition to the thread engagement with theshank;

Fig. 2 is a section thru a bit and a portion of the shank or stem,showing the cooperation wherein the tool herein has special utility;

Fig. 3 is a section on the line III'III, Fig. 1;

Fig. 4 is a fragmentary view from the left of the tool of Fig. 1;

Fig. 5 is a view on the line V--V, Fig. 1;

Fig. 6 is a view on the line VIVI, Fig; 1;

Fig. '7 is a section on the line VII-VII, Fig. 4; and

Fig. 8 is a section on the line VIIIVIII, Fig.7.

Frame or sleeve I has inwardly extending annular bearing portions 2, 3,thru which the work to be acted upon, as shank or stem 4, may protrude.Externally this frame I has annular series of ratchet teeth 5 embracedby ring 6. Pawl I is normally urged by spring 8 to engage the teeth 5for a one-way clutch actuation of the frame I relatively to theoscillatable ring 8 operable by arm 9. This arm 9 has detachableconnection by thread means II with boss I2 radially extending from thering 6. Head I3, fixed with the pawl I, may be pulled radially againstthe resistance of the spring 8, and then angularly shifted to locatecross pin I4 out of the slot I5 and thus hold the pawl I away from theratchet 5 and leave the ring 6 unclutched as to the frame I.

The frame I, laterally of the ring '6, has "flange terminus I6 withradially extending seats I1 into which extend chasers or thread cuttingdie elements I8 in an annular series, with the radial limit therefordetermined by ring I9. These thread cutting die elements I8 have theirinner thread generating termini configured for the type of thread andpitch which may be desired to be substantial for a shank or stem of arock drilling tool. In practice square threads, buttress threads, andeven other special threads may be adopted. Opposing the flange I6 andspaced therefrom by the elements I8 is plate or disk 2I, also havingradially extending seats 22 for locating the elements I8. Bolts 23 thruthe plate 2| and across clearway 24 between the ele ments I8, extend toengage the flange I8 and thereby assemble the cutting means in operativerelation with the frame and complete the thread cutting tool portion.This full clearway, except for the exposed threaded portion of the bolts23, is a feature of efiicient tool performance, in that ready access ishad for lubricating the elements I8 and the work, with ample spill forthe cuttings from the work.

Supplementing the thread cutting, provision is made in this disclosurefor accurate facing of additional portions of the work relatively to thethreads as cut. To this end, upon seat 25 of the plate 2| is locatedring 28 which is assembled by bolts 2'] with second ring 28. The unit26, 28, has bearing on the plate 2| and is angularly shiftablerelatively thereto and as to the elements I8. Bolts 29 assemble radiallyextending arm 38 with the ring unit 26, 28. The free end of this arm 38is provided with handle or grip 3| as an actuator for shifting the unit26, 28, relatively to the frame I as held by the ring 6.

On the face of the ring 28 remote from the frame l, pairs of lugs 32provide therebetween radially extending ways for, in this instance, apair of diametrically disposed cutting tools 34. Fixed cross bars 85,have set screw clamps 38 for locating cutter termini 31, say forcircumferential facing 38 on the work 4, and terminally away from thecut thread 39.

Additionally there may be terminal facing 40 for the work 4, and suchsimultaneously generated with the facing 38, for the ring 28, may haveadditional lugs M in pairs providing radial ways or seats 42 for cutters43. Cross bars 85 with set screws 38 may clamp these cutters 43 to holdtheir cutting edges 44 in position to form the facing 40 on the work 5.The facing, whether by one or more cutters, may conform to the specialconfiguration of the seat for the bit 45, or other type of bit.

In rock drilling operations, the shank or stem is exposed to severetreatment and experiences what is termed fatigue, as well as workingloose relatively to the bit. The threads may be cut left hand, with thenormal bit shifting right hand in the drilling operations in efiort tomaintain the bit and stem in snug assembly. However, the bit is shortlived. Upon occasion for replacement, importance resides that initialseating for the bit as to the shank may be substantial and against anylooseness. While the stem is usually hardened, it may be treated torender it susceptible to redressing, even to cutting off a section. Thisis the special field of utility of the tool of this disclosure, for thework 4 may be located in vise 46 and the tool run up thereon thruoscillation of the arm 9 in cutting a left hand thread 39. As thedesired thread extent is generated suitable for the bit 45, facing meansabut the work. The arm 9 may be held and very slowly progressed thru aminor arc, say up to 30, while with the other hand the operator graspsthe handle 3| for one turn or more, as may be suitable or necessary.With a left hand or counterclockwise thread for the action of theelements I8, the handle 3| may be shifted clockwise. The facing cuttersare held into the work by the elements l8 and their coaction with thegenerated thread 39. Movement of the arm 9 determines feed for thefacing cutters. Accuracy therebetween is thus positively determined bythe casual worker on the job for nicety of bit and shank assembly forefficient drill operation with prolonged life therefor.

What is claimed and it is desired to secure by Letters Patent is:

1. A frame including a pair of opposing rings, chasers for cutting ahelical way on an article of work, each of said rings having outwardlyextending grooves forming a series of seats engaged by the chasers forangularly fixing the rings as to each other, and relatively angularlyshiftable facer cutting means held longitudinally of the work intooperative position as to the work by the chasers cooperation with thework.

2. Thread cutting means for an article of work, a mounting frame for themeans angularly shiftable relatively to the work for generating a threadon the work, and thereby positively controlling shifting of the frameaxially of the work, and relatively angularly shiftable work facingmeans axially outside the frame and terminally of the thread anchoredwith the frame against movement longitudinally relatively to the frameto be held into operative position as to the work for facing the work bysaid thread cooperation with the thread cutting means.

3. A tool comprising a tubular frame adapted to embrace an article ofwork, thread cutting means mounted on the frame for relative angularshifting as to the work, and work facing means provided with a carrierring mounted outside the frame against movement longitudinallyrelatively to the frame and adapted to be held to the work thru thethread cutting means, engagement with the work, said facing means beingangularly shiftable relatively to the thread cutting means independentof progressing relatively thereto.

4. A tool comprising a sleeve thru which the work to be acted upon mayextend, thread cutting means fixed with the sleeve and adapted to coactwith the work, a ring mounted on the sleeve, an actuator connectionbetween the ring and sleeve, an arm for oscillating the ring, a secondring longitudinally fixed with and angularly shiftable relatively to thesleeve, an arm for shifting the second ring relatively to the sleeve,and cutting means located axially outside the frame in being anchoredwith the second ring and adapted to coact with the work away from thethread cutting means and to be fed only with the cutting means.

5. A tool comprising a sleeve providing a frame, an oscillatable ringactuator for the frame, said frame laterally of the ring having aterminus provided with an annular series of radially extending seats, anannular series of thread cutting die means in said seats, a plate spacedfrom the frame by the die means, said plate having seats for the diemeans, said die means determining clearance between the plate and frame,and bolts between the plate and frame maintaining the die meansassembled in the tool and with the die means and seats thereby fixingthe frame and plate against relative angular shifting.

6. A tool comprising a first ring provided with an annular series ofradially extending seats, an annular series of thread cutting die meansin said seats, a second ring spaced from the first ring by the diemeans, said second ring having seats for 'the die means, said die meansdetermining clearance between the rings, and bolts between the ringsmaintaining the die means assembled in the tool with the seats of thetwo rings effective through the die means thereby completing angularfixing of the rings.

7. A thread cutting tool unit comprising a pair of aligned rings havingopposing radially extending ways, an annular series of chasers in saidways with clearance continuous therebetween, and tie means between therings thereby completing through said chasers and seats angular fixingof the rings.

8. A thread cutting tool unit comprising a pair of aligned rings havingopposing radially extending ways, an annular series of thread cuttingdies in said ways with clearance continuous therebetween, and tie meansanchored in the rings and isolated from the dies by said clearance, saidtie means completing through said ways and dies angular fixing of therings.

9. A thread cutting tool unit comprising a pair of aligned rings havingopposing outwardly extending seats, an annular series of thread cuttingdies assembled with the rings to coact with said seats, tie meansbetween the rings and spaced from the dies by clearance, and holdingmeans against radial shifting of the dies, said tie means completingthrough said seats and dies angular fixing of the rings.

10. A thread cutting tool unit comprising a pair of aligned rings havingopposing outwardly extending grooves forming Ways, an annular series ofthread cutting dies assembled with the rings to coact with said grooves,a third ring providing a band about one of the other rings and theoutward termini of its grooves to limit radial shifting of the dies, andcountersunk bolts providing tie means between the pair of rings andisolated from the dies by clearance, said bolts completing through saidways and dies angular fixing of the rings.

WILLIAM W. VOSPER.

